Punch press control



G. O. JOHNSON PUNCH PRESS CONTROL Dec. 22, 1942 Filed March 14, 1942INVENTOR. BY z/a/m d o/a/r/zsa/i A TTORNEYSJ Patented Dec. 22, 1942UNITED esrATE-s PATENT :OF'FICE Gustav 0. .Johnson, Elkhart,' Ind.,.assignor to JohnsorilMachine & PressCorporation Application ill/[arch'14, 1942,.SerialiNo.'.434;697

This invention relates to improvements in punch press controls.

The main objects of-this invention are:

First, to provide an improved single revolution or non-repeat-controlfora treadle operated power press which is operative to unfailingly haltthe press ram'at the conclusion of each-operating cycle, including meansfor preventing damage to the parts and for maintaining the same inoperative -clutch" disengaging position during the period of inoperationof-the press.

Second, to provide a toggle-type control of the foregoing characterincluding a novel clutch bolt disengaging arm and shoe carried thereby,which arm is a two-part construction rendering the same resilient andyieldable'in its'action for the purpose of-preventing damage to thecontrol parts under certain -circumstances.-

Further objects relating to details and economies of my invention willappear from the description to follow. The invention is defined in theclaims.

A structure embcdyingthe features of my-invention is illustrated in theaccompanying drawing, wherein:

Fig. lis a view in side elevation conventionally illustrating aninclinable power press of the type to which the present control isapplied.

Fig; 2 is an enlarged fragmentary view in side elevation, illustratingthe main parts of the single revolution control and in'particular thestructural details ofthe present improvements in said control, the partsbeing shown in operative clutch bolt disengaging position.

"Fig, 3 is a fragmentary view generally similar to Fig. 2, illustratingthe parts in another positionthereof in which the yieldable armfunctions to prevent damage tothe control and to maintain certainportions of the control in their operative clutch disengaging position.

Fig. 4 is a perspective view illustrating the control shoe carrying armand-the two-part yieldable construction thereof adapting the same forthe foregoingv purposes, and

Fig. 5 is a diagrammatical view illustrating alternative positions of.the toggle type clutch shoe applying device incorporated in the control.

In my Patent No. 2,178,205 of October 31, 1939, I illustrate-anddescribe an improved-singlerevolution toggle-type control for aconventional power punch press-which is very effective in unfailinglydisengaging or retracting the usual clutch bolt on the ram shaft orcollar rfromithe press fly wheel at the conclusion ofthe upstroke of.the ram followinga vvpress'operation. The present invention-relatesrto.further improvements in a control of this type. The details orthe saidcontrol and "its operation .are .fully' described in my patent referredto. above, but for the purpose ofcompleteness.andlclality it'is pointedout that the control :includes .an arm, generally designated l,pivoted-to-the press frame at2 at the lowerend thereof and provided atits opposite end ,with a cam-likeshoe 3 of known form adapted to have.camming engagement with the laterally slidable boltl carried by thepress shaft at the conclusion of a cycle of. operation of said shaft, tothereby. urge thesaid bolt laterally to an inoperative position out ofengagement with the fly wheel. A clutch bolt and declutching'shoearrangement of this general type is well known inthe art, hence Ihave-not illustrated thesame in detail since those skilled in the ar't'will be familiar with the -'structure-and operation thereof. a 1

Arm 1 is -norma'lly urged-incounterclockwise direction to operativedeclutching position by means of a toggle arrangement including-a pairof links 5, "Bfthe'formerof which-hasa pivotal connection (tobe\hereinafter more fully described) by meanso'fa-pin'l'tothe arm Imedially of "its length, and the latter of which has a fixed pivotalconnection to the press frame at '8. The toggle links 5; B are pivotallyconnected. at the adjacent ends thereof bya pin B andthe link 8 has arearwardextension 'I 0 on which a counterweight His adjustably'mounted.Stops I2, 13 on the machine frame-limit the movement of the toggle fromoperative straightened position, illustrated in Fig. 2 and in dottedlines in Fig. 5, to the inoperative. position illustrated .in sol'idlines in'Fig. 5. i I

The toggle constituted by arms 5, 6 isadapted to be brokenupon-actuation of the treadle lt of the press through acontrol link orrod l 5 which ispivoted at its lower end to one end of a lever l6,%Lt-he latter being in turn pivoted at its opposite end to the pressframe; "This lever includes an adjusting feature for initially settingthe lever to properly trip-the press, Which-doesnot constitute apart ofthe present invention. -A vertical tension rod 'l'l connects trip leverl6 to the treadle, theconnection-of the parts being such that downwardtreadle-actuation of rod l'l'tends to urge the link IE to the left asviewed in Fig. 2. This tendency is further contributed to byathrust-spring device generally designated l8 whichabuts a fixed bracket19 onthe frame'at one 'end and at the-otherend-bearsag'ainst an a lowerlip 22 which projects substantially be-a neath the pin and insureseffective engagement with the latter on the spring urged upstroke of thelink. At the same time the engagement of the pin in the notch issufilcient to enable the. I when the link is to thereby break.

pin to be drawn downwardly treadle-actuated downwardly, the toggle atpin 9 and withdraw the arm I laterally to the right or incounterclockwise direction about its pivot, thereby withdrawing shoe. 3from operative press declutching engagement with the bolt 4. When thishappens the press ram commences its down stroke.

In order to reset the control parts in opera: tive position so as todeclutch the press at the termination of an operating cycle, link 15 isprovided adjacent its upper end with an adjustable reset follower 23which is engageable by reset cam 24 on the press shaft to swing link l5outwardly, thereby disengaging toggle pin 9 from the control link andenabling the counterweight I l to straighten the toggle and urge arm Iinwardly or in counterclockwise direction to operative position. Thisaction takes place regardless of whether or not the operator hasreleased the treadle.

The above described structure constitutes the subject matter of theabove patent. The present invention relates solely to improvements inthis structure in order to forestall damage under certain conditions andto maintain the toggle in its operative straight condition duringadjustments which it may be desired to make with the press in'declutchedcondition.

Said improvements consist in forming the shoe carrying arm I of two-partconstruction, as illustrated in Figs. 2, 3 and 4, including ,a mainbodymember 25, which carries the pivot boss 2,61by which the member ispivoted to a frame and the shoe 3. The second part of the arm is constituted by a relatively small member 21 formed at one end thereof with arounded pivot area receivable in a correspondingly shaped pivot recessin member 25 immediately above the boss 26 of the latter. At either sideof this area the member 21 has Wings 28 extending on opposite sidesofthe main arm member 25 to maintain the members in lateral alinement.

The member 25 is provided with a transverse boss or enlargement 29 whichis drilled and threaded for the adjustable reception of a threaded pinor stud 30 extending transversely of the arm and freely receivable in analigned recess 3| in the member 21. A conical coil compression springsurrounds the stud, which latter has a set screw type head 33 enablingthe studto be threadedly adjusted in member 25 to thereby regulate theforce exerted by spring 22. Accordingly, spring 32 urges the pivotalengaging members 25 and 21 toward one another. These members areprovided adjacent the free end of the member 21 with coactingsemicircular seats 34, 35, the radius of which is approximately equal tothe radius of the pin 1, which is pivotally re-.

to the parts' ceived therein. This provides a very simple method ofjournaling the end of said to le pin and the pin is maintained ineffective engagement with one or the other of said seats, either by thelateral force exerted on the pin when the toggle is positively broken bylink [5 or by the opposite lateral force exerted by counterweight I Iwhen the toggle is again straightened.

The purpose of the yieldable construction of arm I is to insure that nodamage to the parts, either the arm itself, the clutch bolt 4, or thetoggle members, will occur in the event the press shaft is actuated inthe reverse direction, as indicated by. the arrow in Fig. 3, it beingunderstood that the direction of rotation of said shaft inits'o'perating cycle is counterclockwise, as indicat'ed by the arrow inFig. 2. Thus, should the bolt beforced into engagement with the shoe 3in reversely adjusting or manipulating the press, arm member 25 merelyyields rearwardly or in clockwise direction as viewed in Fig. 3 relativeto the arm member 21, the latter being maintained in fixed position bythe straight toggle linkage. This prevents any damage to any of theparts involved and likewise insures that the said toggle will remainstraight and unbroken, though in position to be instantaneously brokenwhen the treadle is actuated.

An embodiment of theinvention which incorporates the principles of theinvention in a highly desirable manner has been illustrated anddescribed, though I am aware that other embodiments within the intent ofthe invention will suggest themselves to those skilled in the art. Itshould be understood that the foregoing terminology is used onlydescriptively rather than in a limiting sense, and with full intentionto include equivalents'of the features shown and described, within thescope of the following claims.

Having thus described my invention, what .I claim as new and desire tosecure by Letters Patent is: t

1. In a single revolution non-repeat control for a power press of thetype having a clutch bolt operatively engageable with and disengageablefrom a fly wheel to drivingly clutch and declutch the press ram, incombination, a bolt engaging arm pivoted on theframe of the press at oneend thereof and having a shoe engageable with the bolt in the rotationthereof to actuate the same to declutching position, a toggle having onelinkpivoted on said arm and another link pivoted on the press frame,said links being pivotally connected to one another and having meansconnected thereto for urging the toggle to an operative straightcondition, and manually operated means for breaking said toggle tothereby retractsaid arm and withdraw the shoe from operativeengagement-with the bolt, said arm comprising a main shoe carrying armmember pivoted to the press frame, an' auxiliary member pivotallyengageable with said arm member, and spring means for urging saidmembers toward one another, said members being provided with coactingcurved separable seats and said first named link having a pin pivotallyreceivable between said seats to efiect said pivotal mounting of thelink to the arm, said pin being effective to retract said arm memberwhen said toggle is broken, said main arm member being swingableoutwardlyv relative to the auxiliary member under certain conditions toprevent damage to the control parts while maintaining the pivotalengagement .ofzsaidpin with the arm'and said toggle 2 in operativestraight condition.

2. In a single revolution non-repeat control for a power press of thetype having a clutch bolt operatively engageable with and disengageablefrom a fly wheel to drivingly clutch and declutch the press ram, incombination, a bolt engaging arm pivoted on the frame of the press atone end thereof and having a shoe engageable with the bolt in therotation thereof to actuate the same to declutching position, andmanually operated means to retract said arm and withdraw the shoe fromoperative engagement with the bolt, said arm comprising a main shoecarrying arm member pivoted to the press frame, an auxiliary memberpivotally engageable with said arm member, and spring means for urgingsaid members toward one another, said members being provided withcoacting curved separable seats and said manually operated meansincluding a pin pivotally receivable between said seats, said pin beingeffective to retract said arm member when said manually actuated meansis actuated, said main arm member being swingable outwardly relative tothe auxiliary member under certain conditions to prevent damage to thecontrol parts while maintaining the pivotal engagement of said pin withthe arm.

3. In a single revolution non-repeat control for a power press of thetype having a clutch bolt operatively engageable with and disengageablefrom a fly wheel to drivingly clutch and declutch the press ram, incombination a bolt engaging arm pivoted on the frame of the press andengageable with the bolt in the rotation thereof, comprising a main armmember pivoted to the press frame and provided with a bolt control shoe,an auxiliary member pivotally engageable with the main arm member andspring means for urging said members toward one another, said membersbeing provided with coacting curved separable seats therebetween, saidmain arm member being swingable outwardly relative to the auxiliarymember in certain conditions to prevent damage to the control parts, atoggle having a movable link pivoted between said seats, and manuallyoperated means for breaking said toggle to thereby retract said arm andwithdraw the same from operative engagement with the bolt, the togglelink retractingly engaging said main arm member for this purpose.

4. In a single revolution non-repeat control for a power press of thetype having a clutch bolt operatively engageable with and disengageablefrom a fly wheel to drivingly clutch and declutch the press ram, incombination a bolt engaging arm pivoted on the frame of the press andengageable with the bolt in the rotation thereof,

comprising a main arm member pivoted to the press frame and providedwith a bolt control shoe, an auxiliary member pivotally engageable withthe main arm member and spring means for urging said members toward oneanother, said members being provided with coacting separable seats saidmain arm member being swingable outwardly relative to the auxiliarymember in certain conditions to prevent damage to the control parts, atoggle having a movable link pivoted between said seats, and manuallyoperated means for breaking said toggle to thereby retract said arm andwithdraw the same from operative engagement with the bolt, the togglelink retractingly engaging said main arm member for this purpose.

5. A controlling and operating member for a toggle actuated non-repeatpower press control, comprising an arm adapted to be pivotally mountedat one end to the frame of the press and provided at the other end witha bolt control member adapted to control the clutch bolt of the press,said arm having an auxiliary element yieldably pivoted thereto betweenthe ends of the arm enabling lateral separating movement of the arm andelement, said element and arm being provided with separable coactingopposed curved journal surface at a point spaced from the pivotalconnection of the arm and element adapted to pivotally receive a movableend pivot of an actuating member whereby said arm is enabled to pivotrelative to said element under certain conditions, thereby avoidingdanger of damaging the parts of the control under said conditions.

6. A controlling and operating device for a non-repeat power presscontrol, comprising an arm adapted to be pivotally mounted at one end tothe frame of the press and provided at the other end with a boltactuating member, said arm having an auxiliary element yieldably pivotedthereto between its ends, enabling lateral separating movement of thearm and element,

said element and arm being provided with coacting opposed curved journalsurfaces at a point spaced from the pivotal connection of the arm andelement, and a manually actuable means including an actuating elementfor said arm provided with means pivotally receivable between saidjournal surfaces, said arm pivoting relative to said element undercertain conditions without distorting the relationship of said lastnamed means to the element, and avoiding the danger of damaging theparts of the control under said conditions.

GUSTAV O. JOHNSON.

